Product Overview

• One-Part Smooth Finish Formula with Primerless Adhesion on Most Common Construction Surfaces Including KYNAR® Coated Metals
• AAMA Approved
• VOC Compliant – Only 9 g/L
• UV Resistant/Non-Yellowing

CRL M64 is a one-part, moisture curing, gun grade modified polyurethane sealant. It does not require a primer on most common construction surfaces. CRL M64 is durable, flexible, and offers excellent performance in moving joints.

Basic Uses
CRL M64 Modified Polyurethane Construction Sealant is specially formulated to outperform traditional VOC solvent polyurethanes for sealing moving joints in concrete, masonry, metal, and other basic perimeter joint applications. It is ideal for all joints between framing (door and window) and the building structure in both storefront and curtain wall applications to secure a watertight installation. This advanced polymer formula offers excellent adhesion to fluoropolymer paint coatings for metal surfaces including KYNAR®, Duranar®, and Duranar® Sunstorm™ Coatings, as well as standard metal, aluminum, steel, galvanized steel, plastics, vinyl, glass, wood, concrete, brass, and other common building substrates.

CRL M64 is compatible with insulating glass sealants when glazing units and applied as a toe or heel bead. CRL M64 is designed for exterior and interior use. Withstands temperatures after full cure from -75°F to 300°F (-59 to 149°C). Paintable after only two hours with water-based paints.

It is also suitable for varied manufacturing uses, such as the production of travel trailers and mobile homes, and in the assembly of galvanized air conditioning ductwork.

FEATURES
Exceptional adhesion to KYNAR® coated metals.
VOC Compliant – only 9 g/L (Chemically curing < 3%).
Eco-Friendly Product – Solvent-Free, Isocyanate-Free, VOC Compliant, Qualifies for LEED Credit for Section EQ (Indoor Environmental Air Quality).

Low temperature gunning and application above 0°F (18°C).
Service temperature of -75°F to 300°F (-59°C to 149°C).
Permanently Flexible – Will not get hard with age like traditional polyurethanes. Remains flexible in low temperatures.

Fast Cure – Skins over in 30 minutes and continues to cure at a rate of 1/8″ (3 mm) depth per day.

Tooling time – approximately 20-40 minutes, depending on temperature and humidity.

Paintable – Can be painted in only two hours with water-based paints.

UV Resistant – Will not turn yellow from exposure to the sun.

Technical Data
CRL M64 conforms to and passes:
Federal Specification TT-S-00230C, Type II, Class A.
ASTM C920-98, Type S, Grade NS, Class 25, Use NT, M, T, A, G, and O.

ASTM C510, ASTM C639, ASTM C661, ASTM C679, ASTM C717, ASTM C719, ASTM C793, ASTM C794, ASTM C1183, ASTM C1193, ASTM C1246, ASTM D412, ASTM D624, and ASTM G155.
CAN/CGSB-19, 13-M87, Type MCG-2-25-A-N, QPL # 81026.
AAMA 808.3-92 Exterior Perimeter, AAMA 802.3-92 Type II Ductile Back Bedding Compound.

USDA approved for use in meat and poultry areas.
Meets California Air Resources Board 2003 requirements for Volatile Organic Compound (VOC) content. Qualifies for LEED® (Leadership in Energy and Environmental Design) Green Building Rating System™ credit.

Limitations
Do not apply over damp or contaminated surfaces. Use with adequate ventilation. Not recommended for surfaces with special protective or cosmetic coatings without prior consultation of the manufacturer. Should not be applied to mirrors or unpredictable absorptive surfaces such as marble, limestone or granite unless a standard of appearance has been agreed on as a result of testing for stain and/or discoloration. Check cartridge label, MSDS, and Specification Data Sheet for additional limitations.

Comparable Sealants
CRL: M66 Modified Polyurethane Sealant, M65W PermaWhite. Tremco®: Vulkem® 116, Vulkem 921, DyMonic®, Dymonic® FC, TremGlaze U1400, TremPro 626. Sika®: 1A, 15LM. Sonneborn®: NP1. Pecora®: Dynatrol 1. OSI®: PR-255. Schnee Moorehead: 7100 Sealant. Bostik: Chem-Caulk 900.

Product Warning:

Do not apply over damp or contaminated surfaces. Use with adequate ventilation. Not recommended for surfaces with special protective or cosmetic coatings without prior consultation of the manufacturer. Should not be applied to mirrors or unpredictably absorptive surfaces such as marble, limestone or granite unless a standard of appearance has been agreed on as a result of testing for stain and/or discoloration. Check cartridge label and Specification Data Sheet for additional limitations.

Most shipping weights are approximate and have not been verified. If the exact weight is needed in order to determine shipping costs, and shipping costs are required in order for you to complete your order, please request this prior to submitting your order by contacting CRL Customer Service. Product images shown are of the actual product or a close representation. Colors can vary depending on your computer’s video card and on how your monitor’s color is adjusted.